"We wanted to try something a little bit different this year instead of a traditional, clip-based piece," says Academy marketing chief Christina Kounelias. "The trailer has a fun twist that conveys how excited everyone is to have Billy back."

The trailer also features appearances by Robin Williams, Josh Duhamel, Megan Fox, William Fichtner and Vinnie Jones.

"Am doing the Oscars so the young woman in the pharmacy will stop asking my name when I pick up my prescriptions. Looking forward to the show," Crystal cracked in a tweet announcing his umpteenth appointment as Oscar night MC.

"First and foremost I want to say that I completely understand and support each party's decision with regard to a change of producers for this year's Academy Awards ceremony," Murphy said. "I was truly looking forward to being a part of the show that our production team and writers were just starting to develop, but I'm sure that the new production team and host will do an equally great job."

The 84th annual Academy Awards -- going down at the Kodak Theatre in Hollywood -- airs on ABC on Feb. 26.